Final answer:
To find the total number of fence rails in Craig's fence, divide the total fence length by the length of each section. Multiply the number of sections by 2 to account for the top and bottom rail in each section. The total number of fence rails is 400.
Step-by-step explanation:
To find the number of fence rails in total, we need to determine the number of sections that need to be fenced. Each section consists of a top and bottom rail, so we need to divide the total length of the fence by the length of each section to find the number of sections. The length of each section is 3m + 3m = 6m. To find the number of sections, we can divide the total length of the fence (1200m) by the length of each section:
Total number of sections = 1200m / 6m = 200 sections.
Since each section consists of a top and bottom rail, we can multiply the number of sections by 2 to find the total number of fence rails:
Total number of fence rails = 200 sections * 2 rails/section = 400 rails.
Therefore, the total number of fence rails is 400.